Holding his son, William walked forward with his wife to answer a few questions from waiting journalists.

"He's got a good pair of lungs on him, that's for sure," he joked. "He's a big boy, he's quite heavy."

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William and Kate announce their new son

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LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Peter Macdiarmid/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Peter Macdiarmid/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 23: Crowds of well wishers take photographs as Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Peter Macdiarmid/Getty Images)

LONDON, ENGLAND - JULY 23: Crowds of well wishers take photographs as Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Peter Macdiarmid/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images)

LONDON, ENGLAND - JULY 23: Crowds of well wishers take photographs as Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Peter Macdiarmid/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital with their newborn son on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Oli Scarff/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital with their newborn son on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Oli Scarff/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital with their newborn son on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Oli Scarff/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital with their newborn son on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Oli Scarff/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images)

LONDON, ENGLAND - JULY 24: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Peter Macdiarmid/Getty Images)

LONDON, ENGLAND - JULY 24: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Peter Macdiarmid/Getty Images)

LONDON, ENGLAND - JULY 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images)

The safe hands of the Duchess of Cambridge with her son who was born yesterday, leave the Lindo Wing of St Mary's Hospital in west London.

Prince William and Kate Middleton, The Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital with their new born baby boy, Paddington, London.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son. PRESS ASSOCIATION Photo. Picture date: Tuesday July 23, 2013. See PA story ROYAL Baby. Photo credit should read: Jonathan Brady/PA Wire

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

Britain's Prince William and Kate, Duchess of Cambridge hold the Prince of Cambridge, Tuesday July 23, 2013, as they pose for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess gave birth on Monday July 22. The Royal couple are expected to head to Londons Kensington Palace from the hospital with their newly born son, the third in line to the British throne. (AP Photo/Lefteris Pitarakis)

Kate, Duchess of Cambridge holds the Prince of Cambridge, Tuesday July 23, 2013, as they pose for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess gave birth on Monday July 22. The Royal couple are expected to head to Londons Kensington Palace from the hospital with their newly born son, the third in line to the British throne. (AP Photo/Alastair Grant)

Britain's Prince William and Kate, Duchess of Cambridge hold the Prince of Cambridge, Tuesday July 23, 2013, as they pose for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess gave birth on Monday July 22. The Royal couple are expected to head to Londons Kensington Palace from the hospital with their newly born son, the third in line to the British throne. (AP Photo/Lefteris Pitarakis)

Britain's Prince William and Kate, Duchess of Cambridge hold the Prince of Cambridge, Tuesday July 23, 2013, as they pose for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess gave birth on Monday July 22. The Royal couple are expected to head to Londons Kensington Palace from the hospital with their newly born son, the third in line to the British throne. (AP Photo/Lefteris Pitarakis)

The Duchess of Cambridge, Prince William and their newborn son pictured outside the Lindo Wing at St Mary's Hospital, London.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

The Duchess of Cambridge, Prince William and their newborn son pictured outside the Lindo Wing at St Mary's Hospital, London.

The Duchess of Cambridge, Prince William and their newborn son pictured outside the Lindo Wing at St Mary's Hospital, London.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

The Duke and Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital in London, with their newborn son.

Britain's Prince William and Kate, Duchess of Cambridge hold the Prince of Cambridge, Tuesday July 23, 2013, as they pose for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess gave birth on Monday July 22. The Royal couple are expected to head to Londons Kensington Palace from the hospital with their newly born son, the third in line to the British throne.

The Prince of Wales and Duchess of Cornwall leave the Lindo Wing of St Mary's Hospital in London, after he met his new grandson.

The Prince of Wales and Duchess of Cornwall leave the Lindo Wing of St Mary's Hospital in London, after he met his new grandson.

The Prince of Wales and Duchess of Cornwall leave the Lindo Wing of St Mary's Hospital in London, after he met his new grandson.

The Prince of Wales and Duchess of Cornwall arrive at the Lindo Wing of St Mary's Hospital in London, to meet his new grandson.

The Prince of Wales and Duchess of Cornwall leave the Lindo Wing of St Mary's Hospital in London, after he met his new grandson.

Prince Charles and The Duchess of Cornwall visiting Prince William and Kate Middleton, The Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital with their new born baby boy, Paddington, London.

ALTERNATE CROPThe Prince of Wales and Duchess of Cornwall arrive at the Lindo Wing of St Mary's Hospital in London, to meet his new grandson.

The Prince of Wales and Duchess of Cornwall arrive at the Lindo Wing of St Mary's Hospital in London, to meet his new grandson.

The Prince of Wales and Duchess of Cornwall arrive at the Lindo Wing of St Mary's Hospital in London, to meet his new grandson.

Prince Charles and The Duchess of Cornwall visiting Prince William and Kate Middleton, The Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital with their new born baby boy, Paddington, London.

Prince Charles and The Duchess of Cornwall visiting Prince William and Kate Middleton, The Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital with their new born baby boy, Paddington, London.

The Prince of Wales and Duchess of Cornwall arrive at the Lindo Wing of St Mary's Hospital in London, to meet his new grandson.

Prince Charles and the Duchess of Cornwall arrive at the Lindo Wing of St Mary's Hospital, London, to visit the Duchess of Cambridge, Prince William and their newborn son.

The Duchess of Cambridge's parents Carole and Michael Middleton leave the Lindo Wing of St Mary's Hospital in London, after meeting their new grandson.

The Duchess of Cambridge's parents Carole and Michael Middleton leave the Lindo Wing of St Mary's Hospital in London, after meeting their new grandson.

Carole Middleton, the mother of the Duchess of Cambridge as she leaves the Lindo Wing of St Mary's Hospital in London, after meeting her new grandson.

The Duchess of Cambridge's parents Carole and Michael Middleton leave the Lindo Wing of St Mary's Hospital in London, after meeting their new grandson.

The King's Troop Royal Horse Artillery fire a gun salute to welcome the new royal baby in Green Park in London today.

A general view of the gun salute performed by the Honourable Artillery Company (HAC), from Gun Wharf at the Tower of London to mark the birth of a baby boy, at 4.24pm yesterday to the Duke and Duchess of Cambridge at St Mary's Hospital.

Honourable Artillery Company (HAC) City of London Reserve Regiment, fire a 41 Gun Salute to mark the birth of the Duke and Duchess of Cambridge's new baby, Green Park - London

Honourable Artillery Company (HAC) City of London Reserve Regiment, fire a 41 Gun Salute to mark the birth of the Duke and Duchess of Cambridge's new baby, Green Park - London

Honourable Artillery Company (HAC) City of London Reserve Regiment, fire a 41 Gun Salute to mark the birth of the Duke and Duchess of Cambridge's new baby, Green Park - London

The King's Troop Royal Horse Artillery fire a gun salute to welcome the new royal baby in Green Park in London today.

The King's Troop Royal Horse Artillery fire a gun salute to welcome the new royal baby in Green Park in London today.

The Honourable Artillery Company (HAC) polish the guns as they prep their kit and personnel at Armoury House, London for the Royal Gun Salute from the Tower of London for the birth of the Duke and Duchess of Cambridge's baby.

The Honourable Artillery Company (HAC) practice loading the guns as they prep their kit and personnel at Armoury House, London for the Royal Gun Salute from the Tower of London for the birth of the Duke and Duchess of Cambridge's baby.

The Honourable Artillery Company (HAC) pack away the guns as they prep their kit and personnel at Armoury House, London for the Royal Gun Salute from the Tower of London for the birth of the Duke and Duchess of Cambridge's baby.

The Honourable Artillery Company (HAC) polish the guns as they prep their kit and personnel at Armoury House, London for the Royal Gun Salute from the Tower of London for the birth of the Duke and Duchess of Cambridge's baby.

The Honourable Artillery Company (HAC) polish the guns as they prep their kit and personnel at Armoury House, London for the Royal Gun Salute from the Tower of London for the birth of the Duke and Duchess of Cambridge's baby.

Carole and Michael Middleton visiting Prince William and Kate Middleton, The Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital with their new born baby boy, Paddington, London.

Carole and Michael Middleton visiting Prince William and Kate Middleton, The Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital with their new born baby boy, Paddington, London.

Carole and Michael Middleton visiting Prince William and Kate Middleton, The Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital with their new born baby boy, Paddington, London.

Carole and Michael Middleton visiting Prince William and Kate Middleton, The Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital with their new born baby boy, Paddington, London.

Michael and Carole Middleton leave the Lindo Wing at St Mary's Hospital, London, after visiting the Duchess of Cambridge, Prince William and their newborn son.

Michael and Carole Middleton leave the Lindo Wing at St Mary's Hospital, London, after visiting the Duchess of Cambridge, Prince William and their newborn son.

Michael and Carole Middleton leave the Lindo Wing at St Mary's Hospital, London, after visiting the Duchess of Cambridge, Prince William and their newborn son.

Michael and Carole Middleton leave the Lindo Wing at St Mary's Hospital, London, after visiting the Duchess of Cambridge, Prince William and their newborn son.

Michael and Carole Middleton leave the Lindo Wing at St Mary's Hospital, London, after visiting the Duchess of Cambridge, Prince William and their newborn son.

Michael and Carole Middleton leave the Lindo Wing at St Mary's Hospital, London, after visiting the Duchess of Cambridge, Prince William and their newborn son.

John Loughley (left) and Terry Hutt (right) outside the Lindo Wing of St Mary's Hospital in London as it was announced last night that the Duchess of Cambridge given has birth to a boy.

John Loughley outside the Lindo Wing of St Mary's Hospital in London as it was announced last night that the Duchess of Cambridge has given birth to a boy.

John Loughley outside the Lindo Wing of St Mary's Hospital in London as it was announced last night that the Duchess of Cambridge has given birth to a boy.

Kit Arkwright from British Horse Racing delivers a teddy bear dressed in the Queen's racing colours outside St Mary's Hospital in London as the world is eagerly awaiting the first glimpse of the royal baby born to the Duke and Duchess of Cambridge.

Kit Arkwright from British Horse Racing delivers a teddy bear dressed in the Queen's racing colours outside St Mary's Hospital in London as the world is eagerly awaiting the first glimpse of the royal baby born to the Duke and Duchess of Cambridge.

Royal enthusiast Terry Hutt reads the paper outside St Mary's Hospital in London as the world is eagerly awaiting the first glimpse of the royal baby born to the Duke and Duchess of Cambridge.

Police outside the Lindo Wing of St Mary's Hospital in London as the world is eagerly awaiting the first glimpse of the royal baby born to the Duke and Duchess of Cambridge.

Well wishers outside the Lindo Wing of St Mary's Hospital in London as the world is eagerly awaiting the first glimpse of the royal baby born to the Duke and Duchess of Cambridge.

Wellwishers waiting outside Buckingham Palace for the announcement of the royal birth. The Duchess of Cambridge has today given birth to a son.

Sky News presenter Kay Burley (left) with Sky Royal correspondent Paul Harrison (right) outside the Lindo Wing of St Mary's Hospital in London as it was announced last night that the Duchess of Cambridge has given birth to a boy.

LONDON, ENGLAND - JULY 23: The gynaecologists (C) Marcus Setchell and (R) Alan Farthing depart the hospital after delivering the baby boy of The Duke and Duchess of Cambridge at the Lindo Wing, St Mary's hospital on July 23, 2013 in London, England. (Photo by Karwai Tang/WireImage)

LONDON, ENGLAND - JULY 22: A close-up of the easel which stands in the Forecourt of Buckingham Palace to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital on July 22, 2013 in London, England. (Photo by John Stillwell/WPA Pool/Getty Images)

LONDON, ENGLAND - JULY 22: Members of the public wear masks representing the Duke and Duchess of Cambridge as they celebrate the announcement of the birth of a baby boy outside the Lindo Wing at St Mary's Hospital on July 22, 2013 in London, England. Kensington Palace announced that The Duchess of Cambridge gave birth to a baby boy at 16.24 BST, with Prince William, Duke of Cambridge present for the birth. A bulletin announcing the birth has been posted in the forecourt at Buckingham Palace. (Photo by Dave Hogan/Getty Images)

Members of the public try to take photos of an easel in the Forecourt of Buckingham Palace with the notification, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

Members of gather outside Buckingham Palace after an easel was placed in the Forecourt of the Palace with the notification, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

Marcus Setchell, Surgeon Gynaecologist to Queen (centre), with other members of his team , names not known leaves the St Mary's Hospital in London following the birth of a baby boy to the Duchess of Cambridge.

The crowd outside the St Mary's Hospital in London following the birth of a baby boy to the Duchess of Cambridge.

Marcus Setchell, Surgeon Gynaecologist to Queen (centre), with other members of his team , (names not known) leaves the St Mary's Hospital in London following the birth of a baby boy to the Duchess of Cambridge.

Marcus Setchell, Surgeon Gynaecologist to Queen (centre), with other members of his team (names not known), leaves the St Mary's Hospital in London following the birth of a baby boy to the Duchess of Cambridge.

Members of gather outside Buckingham Palace after an easel was placed in the Forecourt of the Palace with the notification, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

The Queen's Press Secretary Ailsa Anderson with Badar Azim a footman place on an easel in the Forecourt of Buckingham Palace a notification, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

The large waiting crowds cheers as they read the news on an easel in the Forecourt of Buckingham Palace, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

A Town Crier (name not known) outside the St Mary's Hospital in London announcing the birth of a baby boy to the Duke and Duchess of Cambridge.

The crowd after a Town Crier announced outside the St Mary's Hospital in London the birth of a baby boy to the Duke and Duchess of Cambridge.

The crowd after a Town Crier announced outside the St Mary's Hospital in London the birth of a baby boy to the Duke and Duchess of Cambridge.

A Town Crier (name not known) outside the St Mary's Hospital in London announcing the birth of a baby boy to the Duke and Duchess of Cambridge.

Fans outside the Lindo Wing of St Mary's Hospital, in Paddington, London, celebrate the announcement of the birth of the royal baby.

A Town Crier (name not known) outside the St Mary's Hospital in London announcing the birth of a baby boy to the Duke and Duchess of Cambridge.

The crowd after a Town Crier announced outside the St Mary's Hospital in London the birth of a baby boy to the Duke and Duchess of Cambridge.

The crowd after a Town Crier announced outside the St Mary's Hospital in London the birth of a baby boy to the Duke and Duchess of Cambridge.

Crowds gather outside the Lindo Wing of St Mary's Hospital, in Paddington, London, following the announcement of the birth of the royal baby.

A Jaguar car is driven into the Forecourt of Buckingham Palace bringing the news to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

A Jaguar car is driven into the Forecourt of Buckingham Palace bringing the news to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

The Queen's senior Page Philip Rhodes (right) is given the official notification in the forecourt of Buckingham Palace, to announce the birth of a baby boy at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London. PRESS ASSOCIATION Photo. Picture date: Monday July 22, 2013. See PA story ROYAL Baby . Photo credit should read: John Stillwell/PA Wire

The Queen's senior Page Philip Rhodes (right) is given the official notification in the forecourt of Buckingham Palace, to announce the birth of a baby boy at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

The Queen's senior Page Philip Rhodes (right) is given the official notification in the forecourt of Buckingham Palace, to announce the birth of a baby boy at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

The Queen's senior Page Philip Rhodes (right) is given the official notification in the forecourt of Buckingham Palace, to announce the birth of a baby boy at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

The large waiting crowds cheers as the Queen's Press Secretary Ailsa Anderson with Badar Azim a footman place on an easel in the Forecourt of Buckingham Palace a notification, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London. PRESS ASSOCIATION Photo. Picture date: Monday July 22, 2013. See PA story ROYAL Baby . Photo credit should read: John Stillwell/PA Wire

The Queen's Press Secretary Ailsa Anderson with Badar Azim a footman place on an easel in the Forecourt of Buckingham Palace a notification, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London. PRESS ASSOCIATION Photo. Picture date: Monday July 22, 2013. See PA story ROYAL Baby . Photo credit should read: John Stillwell/PA Wire

The Queen's Press Secretary Ailsa Anderson with Badar Azim a footman place on an easel in the Forecourt of Buckingham Palace a notification, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

The large waiting crowds cheers as the Queen's Press Secretary Ailsa Anderson with Badar Azim a footman place on an easel in the Forecourt of Buckingham Palace a notification, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

The Queen's Press Secretary Ailsa Anderson with Badar Azim a footman place on an easel in the Forecourt of Buckingham Palace a notification, to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London.

An easel stands in the Forecourt of Buckingham Palace in London to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital.

A ragout of how the Press Association announced the birth the first child of the Duke and Duchess of Cambridge on its wires.

A man leaves the St Mary's Hospital in London enroute to Buckingham Palace after the Duchess of Cambridge gave birth to boy.

A man leaves the St Mary's Hospital in London enroute to Buckingham Palace after the Duchess of Cambridge gave birth to boy.

A man leaves the St Mary's Hospital in London enroute to Buckingham Palace after the Duchess of Cambridge gave birth to boy.

A man leaves the St Mary's Hospital in London enroute to Buckingham Palace after the Duchess of Cambridge gave birth to boy.

A man leaves the St Mary's Hospital in London enroute to Buckingham Palace after the Duchess of Cambridge gave birth to boy.

The crowd gathers as a man leaves the St Mary's Hospital in London enroute to Buckingham Palace after the Duchess of Cambridge gave birth to boy.

Handout photo of the press release from Kensington Palace for the announcement of the baby boy to the Duke and Duchess of Cambridge.

Police officers outside the Lindo Wing of St Mary's Hospital in London, after the Duchess of Cambridge was admitted to the hospital in the early stages of labour.

Members of the scouts arrive at the Lindo Wing of St Mary's Hospital in London, to deliver a baby carrier, after the Duchess of Cambridge was admitted to the hospital in the early stages of labour. The Duchess is a volunteer in the Scout Association.

Members of the scouts arrive at the Lindo Wing of St Mary's Hospital in London, to deliver a baby carrier, after the Duchess of Cambridge was admitted to the hospital in the early stages of labour. The Duchess is a volunteer in the Scout Association.